I opened them up in Calibre's viewer and the TOC button is unavailable - which means they have to TOC. I would have to convert them to .mobi to use on my Kindle, not sure if it makes a TOC in the conversion or not.

I opened them up in Calibre's viewer and the TOC button is unavailable - which means they have to TOC. I would have to convert them to .mobi to use on my Kindle, not sure if it makes a TOC in the conversion or not.

Strange, the TOC definently works on my PRS-600, it also works on O' Reilly's bookworm reader website.